Isle Royale Rainfall Forecast

Today 18 May
95%
Tue 19 May
95%
Wed 20 May
No Rain
Thu 21 May
No Rain
Fri 22 May
15%
Sat 23 May
15%
Sun 24 May
15%

Isle Royale Rainfall Statistics

May Rainfall

Copper Harbor (58.4 miles)

Total Rainfall 2026
10.8in
Daily Average 2026
0.1in
Wettest Day 18 February, 2026
1.1in
Wet Days 2026
67/138 (49%)
Total Rainfall April
2.6in
Daily Average April
0.1in
Wettest Day 2 April, 2026
0.6in
Wet Days April
14/30 (47%)
Total Rainfall May
0.3in
Daily Average May
0.02in
Wettest Day 12 May, 2026
0.2in
Wet Days May
3/18 (17%)

Climate (2010–Present)

Copper Harbor (58.4 miles)

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Annual Average 2021–2025
27.2in
Monthly Average 2021–2026
2.3in
Daily Average 2021–2026
0.1in
Wettest Day 23 July, 2021
2.7in

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